<template>
    <div>
       <!-- 导航区域 -->
       <el-breadcrumb separator-class="el-icon-arrow-right">
          <el-breadcrumb-item :to="{path:'/home'}">首页</el-breadcrumb-item>
          <el-breadcrumb-item>商品管理</el-breadcrumb-item>
          <el-breadcrumb-item>商品列表</el-breadcrumb-item>
       </el-breadcrumb>

       <!-- 卡片区域 -->
       <el-card>
           <!-- 提示区域 -->
           <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
           <!-- 步骤条区域 -->
           <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
               <el-step title="基本信息"> </el-step>
               <el-step title="商品参数"> </el-step>
               <el-step title="商品属性"> </el-step>
               <el-step title="商品图片"> </el-step>
               <el-step title="商品内容"> </el-step>
               <el-step title="完成"> </el-step>
           </el-steps>

           <!-- tab栏区域 -->
           <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
              <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="addForm.goods_cat" @change="handleChange"></el-cascader>
                    </el-form-item>
                </el-tab-pane>

                <el-tab-pane label="商品参数" name="1">
                    <!-- 渲染表单item项 -->
                    <el-form-item :label="item.attr_name" v-for="item in manyTabData" :key="item.attr_id">
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox border :label="it" v-for="(it,i) in item.attr_vals" :key="i"></el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>

                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="attr_name" v-for="item in onlyTabData" :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>

                <el-tab-pane label="商品图片" name="3">
                    <!-- headerObj请求头 -->
                    <el-upload action="uploadUrl" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :header="headerObj" :on-success="handleSuccess">
                        <el-button size="mini" type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>

                <el-tab-pane label="商品内容" name="4">
                    <!-- 富文本编辑器 -->
                    <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                    <!-- 添加商品的按钮 -->
                    <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                </el-tab-pane>
              </el-tabs>
           </el-form>
       </el-card>

       <!-- 图片预览 -->
       <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
           <img :src="previewPath" class="previewImg">
       </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'
export default {
    data(){
        return {
            activeIndex:'0',
            // 添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                // 商品所属的分类数组
                goods_cat:[],
                // 图片数组
                pics:[],
                // 商品的详情描述
                goods_introduce:'',
                attrs:[]
            },
            addFormRules:{
                goods_name:[
                    {required:true,message:'请输入商品名称',trigger:'blur'}
                ],
                goods_price:[
                    {required:true,message:'请输入商品价格',trigger:'blur'}
                ],
                goods_weight:[
                    {required:true,message:'请输入商品重量',trigger:'blur'}
                ],
                goods_number:[
                    {required:true,message:'请输入商品数量',trigger:'blur'}
                ],
                goods_cat:[
                    {required:true,message:'请输入商品分类',trigger:'blur'}
                ]
            },
            // 商品分类列表
            catelist:[],
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            // 动态参数列表数组
            manyTabData:[],
            // 静态属性数组
            onlyTabData:[],
            // 上传图片的URL地址
            uploadUrl:'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false
        }
    },
    // 声明周期函数
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有商品分类数据
        async getCateList(){
            const {data:res}=await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error('获取商品分类失败')
            }
            this.catelist=res.data
        },
        // 级联选择器选中项变化，会触发这个函数
        handleChange(){
            // 只能选择三级标签
            if(this.addForm.goods_cat.length!==3){
                this.addForm.goods_cat=[]
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            if(oldActiveName==='0'&&this.addForm.goods_cat.length!==3){
                this.$message.error('请选择商品分类')
                return false
            }
        },
        async tabClicked(){
            // 访问的是动态参数面板
            if(this.activeIndex==='1'){
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:'many'}
                })
                if(res.meta.status!==200){
                    return this.$message.error('获取动态参数列表失败')
                }
                res.data.forEach(item=>{
                   item.attr_vals = item.attr_vals.length===0?[]:item.attr_vals.split(' ')
                })
                this.manyTabData=res.data
            }else if(this.activeIndex==='2'){
                 const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:'only'}
                })
                if(res.meta.status!==200){
                    return this.$message.error('获取动态参数列表失败')
                }
                res.data.forEach(item=>{
                   item.attr_vals = item.attr_vals.length===0?[]:item.attr_vals.split(' ')
                })
                this.onlyTabData=res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file){
            console.log(file)
            this.previewPath=file.response.data.url
            // 显示预览图片对话框
            this.previewVisible=true
        },
        // 处理移出图片的操作
        handleRemove(file){
            console.log(file)
            // 1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tem_path
            // 2.从pics数组中，找到这个图片对应的索引值
            const i= this.addForm.pics.findIndex(x=>x.pic===filePath)
            // 3.调用数组的splice方法，把图片信息对象，从pics数组中移出
            this.addForm.pics.splice(i,1)
            console.log(this.addForm)
        },
        // 监听图片上传成功的事件
        handleSuccess(response){
            // 1.拼接得到一个图片信息对象
            const picInfo={pic:response.data.tem_path}
            // 2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        // 添加商品
        add(){
            // 表单预校验
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项')
                }
                // 执行添加的业务逻辑
                // lodash cloneDeep(obj)
                // 深拷贝
                const form = _cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')

                // 处理动态参数
                this.manyTabData.forEach(item => {
                    const newInfo={
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                      }
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTabData.forEach(item=>{
                    const newInfo={
                        attr_id:item.attr_id,
                        attr_value:item.attr_vals
                      }
                     this.addForm.attrs.push(newInfo)
                })
                form.attrs=this.addForm.attrs
                console.log(form)

                // 发起添加请求添加商品
                // 商品的名称，必须是唯一
                const {data:res}=await this.$http.post('goods',form)
                if(res.meta.status!==200){
                    return this.$message.error('添加商品失败')
                }
                this.$message.success('添加商品成功')
                // 编程式路由导航
                this.$router.push('/goods')
            })
        }
    },
    // 计算属性
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length===3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin:0 10px 0 0 !important
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top:15px;
}
</style>
